It's at apple.com, in an FTP archive, IIRC. You need to get an Apple ID, but it's all there.
I would NOT trust any of the legacy CD's found at these other sites. At least one of them was corrupt with bad files, and who knows about the rest?
What don't you understand? Why do you suppose there are many parts???!!!! It's because they are meant to be placed on individual floppy disks! Try it!